The square root of 162 is 12.72. The number can be found by using the square root function on a calculator or by estimating it based on the values of two perfect square roots that surround the number.
The cube root of 54 is equal to 3.78. The cube root of a number, x, is equal to the number, y, such that y times y times y equals x. For the number 54, 3.78 times 3.78 times 3.78 is equal to 54.